btrfs: add dev maxs limit for __btrfs_alloc_chunk in kernel space
For RAID0,5,6,10, For system chunk, there shouldn't be too many stripes to make a btrfs_chunk that exceeds BTRFS_SYSTEM_CHUNK_ARRAY_SIZE For data/meta chunk, there shouldn't be too many stripes to make a btrfs_chunk that exceeds a leaf. Signed-off-by: NGui Hecheng <guihc.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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